Delivery mechanism for salt pans and the like



G. PALTZER Aug. 6, 1929.

DELIVERY MECHANTSM FOR SALT PANS ANDTHE LIKE Filed Aug. 29, 1927 2Sheets-Sheet Aug. 6, 1929. G. PALTZER 1,723,380

DELIVERY MECHANISM FOR SALT FANS AND THE LIKE Filed Aug. 29, 1927 2Sheets-Sheet 2 Patented d,

tlhll'lhfl STATES EPATENT ill G-EORG PALTZER, (3F BASEL, SWITZERLAND,ASSIGNOR TO THE SCHWEIZERISJI-IE RHETNEEALIITEN, U1 Elf/31V! IEIZERLLITLLE, NEAR LAND.

nane t1 VEEEINIGTE .tl aSlElL, EtVITZEE- DELIVERY IDIIEGHANISM FUR SALTFANS AND THE LIKE.

Application filed August 23, 1927, Serial No. $16,315, and inSwitzerland September 15, 19. .16.

This invention relates to delivery mechanism for salt or evaporatingpans with reciprocating scrapers, which are raised for the return orinoperative movement:

In the known constructions oi? pans of this type, the reciprocatingmovement of the scraper is effected by cable or chain drive, whichdepends on the use of complicated control mechanism for the torward andbackward movement of the scrapers and also dis-- advantageously affectsthe efficiency of the apparatus.

According to the invention, for the purpose ozt simplifying the drive, Iarrange for effecting the reciprocating motion oi the scraper by meansof-a carriage movable forwards and backwards in such a manner th one andthe same hollow shaft, which can ries the free scrapers and a liftingdevice serving to raise them for the return movcment, is at the sametime adapted for the axial housing of a rotating, electrically drivendriving shaft, which effects, in known manner, by its rotation, theforward and backward movement of the scraper car riage on lateral guiderails.

The accompanying drawing illustrates one form of construction embodyingthe invention and having electric motors for cont-rolling the differentmovements.

In the said drawing- Figure 1 is a vertical part section, in whichcertain intermediate parts of a salt pan and the scraper carriage arebroken away.

Figure 2 shows the driving side of the scraper carriage, and

Figure 3 is a crosssection through the hollow shaft with the freescrapers and the lifting device shown diagrammatically.

Figure 4- shows a reversing switch arrangement for said electric motors;

Figure 5 represents a detail.

Transversely across the salt pan or there extends a horizontal hollowshaft 6 which is guided at its ends by means of the hearing members 0and (Z and the rollers 6 along parallel lateral guide rails f andtogether with the members 0, (Z forms a travelling torward and backwardmoving carriage. On the shaft 6 are arranged side by side the scrapersg, freely rotatable thereon, the number thereof varying according to thebreadth of the pan, and being distributed over the said breadth, in sucha manner that their ends overlap one another. On the working stroke, thetree scrapers g bearing on the material in the pan, scrape the crystalsin the known manner; for the return movement, the scrapers g are raised,in the manner shown diagrammatically in Figure 3, by a litter 71., whichsecured on the shalt I), as shown in Figure 5 so that they can bereturned inoperatively to the initial position of the working stroke.

The hollow shaft Z) serves, at the same time, for carrying a drivingshaft 2' extending axially through it. This is provided at its ends withtoothed wheels is which ongage in rack teeth provided on the undersideof the guide rails By rotating the driving shatt 2', the aforesaidcarriage is driven forwards and backwarcs with the scrapers on the rails7.

The drive of the shaft z is effected by an electro-motor m by means oi.a worm gear. These parts are mounted on a side cheek 0 (Figure 2) of thecarriage. This side cheek carries also an electro-motor a, which, by

means of a screw-spindle p, aetuates a car rier sleeve g which, by meansol the lcvcrarm 1 rotates the hollow shaft F) with the litter it throughan angle necessary for raising tle loosely movable scrapers. At the endsof the carriage path the rotation of the electro-motors is reversed inthe known manner by means of an automatically operated limit switcharrangement controlling the circuit of the motors. This switcharrangement is for example shown in Figure 4, wherein the two electricmotors m, a are combined respectively with reversing switches an, a themovable members of which are coupled to a reversing rod 8 carried by the:arriage and adapted to strike alternately against stops 2? at the endsof the carriage stroke to produce, by means of said switches, reversalof the rotation of the mo tors m, a and to thus cause the reverse movement oi the carriage as well as the raising or lowering of the scrapersg as the case may be.

What I claim is 1. In a delivery mechanism for salt pans and the like, atransverse hollow shaft, a scraper arranged thereon, a litter forlifting the scraper out of operative position, supporting members forsaid shaft to form therewith a travelling carriage, a guide-way for thiscarriage, a rotary driving shaft ex tending axially through said hollowshaft,

7 gear members connected to said driving shaft to cause travelling ofsaid carriage along its guide-Way, an electromotor mounted on saidcarriage for rotating said driving shaft and means arranged on saidcarriage to actuate the aforesaid lifter.

'2. In a delivery mechanism for salt pans and the like, a transversehollow shaft, a scraper loosely arranged thereon, a lifter secured onsaid shaft for liftingthe scraper out of operative position, supportingmembers for said shaft to form therewith a travelling carriage, aguide-way for this carriage, a rotary driving shaft extending axiallythrough said hollow shaft, gear members connected to said driving shaftto cause travelling ofsaid carriage along its guide-Way, an electromotormounted on said carriage for rotating said driving shaft and means torotate said hollow shaft in order to actuate the aforesaid lifter.

3. In a delivery mechanism for salt pans and the like, a transversehollow shaft, a scraper arranged thereon, a lifter for lifting thescraper out of operative position, supporting members for said shaft toform therewith a travelling carriage, a guide-way for this carriage, arotary driving shaft extending axially through said hollow shaft toothedwheels carried by said driving shaft and rack teeth on said guide-wayengaged by said toothed wheels to produce travelling of said carriagealong its guide-way, an electroinotor mounted on said carriage forrotating said driving shaft and means arranged on said carriage toactuate the aforesaid lifter.

In witness whereof I have hereunto signed my name this 17th day ofAugust, 1927.

GEORG PALTZEL.

